Surfacing-machine spindle attachment



July 5,1927.

A. E. MAYNARD SURFACING MACHNE SPINDLE ATTACHMENT Filed AuE. '7, A 1924 i qm INVENTOR aynard.

Patented( July 5, 1927.

' UNIT-D ,statins Arai j v1,634,952 raies.;

ALBERT n. MAYNABD, or sournsninsn, 'utlisation-*esame Assis-Noa To AlwinRrCAN v OPTICALl COMPANY, Aor sournzsnrnsn, Massimi-:nanars A VOLUNTARY .associa TION OF MASSACHUSETTS.

sURFAcING-MACHINE sieiNnLE Afrmitici-rivistifr.`

Application flied August 7, 1924. serial No. 730,775.

The present `invention relates toan im- Y proved lens surfacing machine and has particular reference yto an attachment therefor which is adapted to prevent chattering of the machine when muse.

An important object ofthe invention is to provide an attachmentv for a'lens surfacing machine which is adaptedto control the eccentricity of the lens holding block` with respect tothe drive 'spindle therefor.

Another very important objectof the invention is to provide Ya 'lens' surfacing machine attachment of the classr described that is capable of changing the eccentricity of the lens holding block with respect to the drive spindle and to bel locked into adjusted position while at the Vsame time the attachment is so arranged that it will prevent chattering of the machine during the surfac- 1 ing operations thus overcoming the objectionable feature of the prior art structures.

Other objects land advantages of the invention will become apparent during the course of the following description. y In the drawings, wherein like numerals are employed to. designatev like parts throughout the same,

Figure 1 is aperspective view showing a lens surfacing machine embodying my invention.

Figure 2 is an enlarged elevation of the attachment.

Figure 3 is a section taken on line 3--3 in Fio'ure 2. l

n the drawings, wherein for the purposes of illustration is shown a preferred embodiment of the invention, the numeral` 5 designates a lens surfacing machine having a base 6 and the adjustable head 7. Journaled through the base 6 is a lens surfacing tool supporting shaft S'andadapted to move into and out of alinement therewith and journaled th'rouOh the adjustable head 7 is a spindle 9. Tie various means for regulating the position of the upper spindle 9 with res )ect to the surfacing tool supported on the siaft 8` are well known in the art. In the present instance the exact adjustment is measured by means of lthe curved scale plate 10 and indicator v11.

Heretofore, a crank arm member was associated with the lower end of the spindle 9 to rotate thelens block and lens 12 in a circular path. These old forms of crank arms have introduced what is knownV as vibration orchatterlng, resulting in an uneven and undesirable lens, and often breakage to the lens,

In the present instance, I providetheV l lower end of the spindle '9 with the elongated Vslot 13. F urthermore the end of the spindle 9 is reduced, as `at 14.' My attachment comprises the body portionl 15 which is adapted to be slipped on to the reduced end ll of the spindle as is clearly shown in'Figure 3 of the drawings. The lsleeve 16 is adapted to be islidably mounted on'end of the body portion 15, the said sleeve having a substantially closed end 17 having an -eccentrically arranged aperture formed therein as at 18, a rotatable plate 19 having a linger 2O is adapted to be associated with the closed end 17 of the sleeve in such a manner that the linger' 2O will be received in the aperture 18 and to prevent accidental displacement thereof the ysaid screw'cr the like 21-is adapted to bear thereagainst. The pin 22 is passed through the sleeve 16,body portion 15, and elongated slot 13to restrict the relative movement between the parts. The coiled spring 23 is disposed between the lower end of the spindle 9 and the end 17 of the sleeve 16 so as to normally urge the said parts in opposite direction, being restricted in this movement by the pin 29.

A rotatable plate 19 is provided with an aperture adapted to receive a portion of the lens block engaging pin 24- as is clearly shown. As is shown in Figure 2, the rotatable plate 19 is provided with the graduations 25 so that the nlate can be rotated in the aperture 18 win knowledge of the exact position of the pin 2st. Ars is shown in full lines in Figure 3 the lens block engaging pin 2-1- is mounted off center from the axis of the spindle 9 and by means of aov the rotation of the plate 19 the member 24 at the bottoni of the spindle 9, no chattering takes place and thus accurate and smooth lenses can he surfaced.

It is to he understood that the torni of the invention. lwrewith shown and described is to ho taken as the preferred embodiment of the Seine and that 'various changes in the shape, size, an d arrangement o'l2 the parts may he resorted to without departing from the spirit oi the invention or the scope ol the Snhjoined Claims.

Having` thus fileeerhed my invention, I elaiinz- 1. In Cornhinntion with a lens sani-facing machine epindle :md a lens hloel:` an attachment to regulate the moren'lent ot' the block eolnprieinp; a hotly portion mounted on the spindle, a slidahle sleeve on thehodr portion, a lens block engaging' pin rarrietl hy the Said. sleeve` and means to more the sa'r! pin into and ont, oit :ilineinent with the anni ot the, said spindle.

2. ln Combination with a lone` surfacing machine spindle and a iene hhwh` an :ittai-lr ment :for determininol the movement ot the lens block comprising e hody portion earried hy the spindle.` a` sleeve haringl a chmod end mounted on the hotly portion and slidehle thereon, means to norinalh7 urge the parts in opposite directions, means to restrict the movement thereot, a lens block engaging pin associated with the Sleeve and ecljnstahle with respect to the axis of the said lepindle.

1:5. In combination with a lens Surfaoil'lgr nnlehine spindle and a lens block, an attachment for determining the relative movement of the lens block with respect to the spindle emnprising means carried on the end of the spindle, a rotatable plate eeeentrioally carried by said means with respect to the Spindle and :1 lens block enga-ging; pin earriecl by the Said rotatable plate and movable therewith.

4;'. ln a device oi the Chnrz'lieter described a spindle haring an elongated slot near its end7 a tnhular slide on the end of the spindle, a Second tubular slide on the tiret, a pin extending thru the two slides into the. elongated Slot, a Spring; between the end oi? the spindle and the end of the leeoond slide adapted to press the parte away 'from each other, a rotatahle plete in the end oit the second, Slide eeeentrioaliy pivoted with respeci; to the axis ot the spindle and a bean ing` pin on the plate intermediate its oenter and edge.

ALBERT E. NAYNARD. 

